Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 6, Problem 8P
To determine
The traffic conditions under which Greenshields model is used over Greenberg model.
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Do you agree that a traffic intensity of greater than 0.8 indicates congestion? Explain your answer.
An engineering student has been instructed to obtain the density of traffic fora road. She has no access to traffic recording instruments and has no budget.Advise her on a suitable method and explain how she should determinedensity given her limited resources.
ramps within 3 miles upstream and downstream of
the segment midpoint. It is on rolling terrain with
10% heavy vehicles and is operating at capacity with
a peak-hour factor of 0.9. If the road is expanded to
four 11-foot lanes with a 2-foot right shoulder, and
traffic after the expansion is projected to increase by
10% with the same heavy vehicle percentage and
peak-hour factor, what is the new LOS and
estimated density?
P-22 Chapter 6
Problems
hour. What would be the LOS before and after the
heavy vehicles are allowed on the upgrade
(assuming 50% SUTs and 50% TTs.)?
6.21 A multilane highway has four lanes (two lanes
in each direction) and a measured FFS of 55 mi/h.
The directional peak-hour volume is 1900 vehicles
(the peak-hour factor is 0.80). One upgrade is 5%
and is 0.62 mi long. Currently, heavy vehicles are
not permitted on the highway, but local authorities
are considering allowing heavy vehicles on this
upgrade. If this is done, they estimate that 150
heavy vehicles will use…
Chapter 6 Solutions
Traffic and Highway Engineering
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - The arrival times of vehicles at the ticket gate...Ch. 6 - Prob. 27P
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- Three ways to reduce traffic delays are available to you. What distinguishes one from the other?arrow_forwardQUESTION 7 The 4 northbound lanes of a rural freeway segment have 13 ft lane widths. There is no lateral clearance afforded on either side of the road. There are no ramps within the area of influence. What is the estimated FFS (mph)? Provide your answer to the nearest tenths.arrow_forwardNote: Give me both right answers effectively. A. Explain the difference between "capacity" and a "service flow rate" for an uninturrepted flow fecility? B. What is the safe stopping distance for a section of rural freeway with a design speed of 80 mi/h on a 2% downgrade?arrow_forward
- QUESTION 6 The 2 eastbound lanes of a rural divided highway have 13 ft lane widths. There is no lateral clearance afforded on either side of the road. There is an access density of 20 access points per mile. What is the estimated FFS (mph) if the BFFS is 60 mph? Provide your answer to the nearest tenths.arrow_forwardQUESTION 8 The 3 eastbound lanes of a rural freeway segment have 11 ft lane widths. There is a 3 ft lateral clearance on the right side of the road. There are no ramps within the influence area. What is the estimated FFS (mph)? Provide your answer to the nearest tenths.arrow_forwardQuestion 2 Because the new travel time rate (TTR) from the additional traffic (e.g., 300vph) exceeds the minimum acceptable local standard of 2.0 min/mile, it is proposed to increase the road capacity by 900vph/lane by adding one lane in each direction. Calculate the new travel time rate and traffic volume using: a. The traditional method of traffic impact analysis, and b. The above-mentioned pivot point analysis method. c. Compare the results of the two methods and comment on their significance.arrow_forward
- Calculate the minimum passing sight distance required for a two-lane rural highway that has a posted limit of 72 kph. The local traffic engineer conducted a speed study of the subject road and found the following: Average speed of passing vehicle= 76 kph Average acceleration of passing vehicle= 2.3 kph/sec Average speed of impeder vehicles= 64 kph Show complete solution. Need ASAP. Thank you.arrow_forwardQ2 b Explain the factors needed to consider when deciding on a Traffic signal or roundabout solution for an intersection. c Explain the factors involed in transport crashes.arrow_forwardQUESTION 7 An old divided 6-lane (3 lanes each direction) highway has 11 ft lanes and obstructions leaving no more than 2 ft of clearance on each side of the roadway. There are no driveways or intersections on the segment of interest. Given a posted speed limit of 50 mph, estimate the FFS (mph) for the 3 northbound lanes? Provide the answer to the nearest tenths.arrow_forward
- How much time (in seconds) does a person traveling on a grade of -1% at a speed of 69 mph have to hit the brakes to stop before hitting a monster seen in the middle of the road 970 feet away? Assume the practical stopping distance equation and the AASHTO standards for unspecified variables apply.arrow_forwardPLEASE WRITE THE SOLUTIONS A T-intersection has a total of 2,400 collision incidents over the last 5 years. Given that the annual daily traffic recorded for this period is 57,079. Determine the accident rate of the intersection per million entering vehicle? A__23.039 accidents per mev. B__23.309 accidents per mev. C__23.093 accidents per mev. D__23.390 accidents per mev. The design speed of a parabolic curve is 80 kph having a soil grade of g1 = 3% and g2 = -4% with Sp =550m. Determine the length of the curve? A__2112m B__2113.5m C__2113.510m D__2131.510m If a town has a total of 152,400 registered vehicles in 2016. Determine the rate of accident per 9,000registered vehicles if the number of accidents on the same is 356? A__21.024 accidents per 9,000 vehicles B__22.024 accidents per 9,000 vehicles C__20.024 accidents per 9,000 vehicles D__None of the abovearrow_forwardQuestion 4 One stretch of two-lane two-way roadway that traverses through level terrain is expected to carry 1400 vehicle per hour. Determine the Level of Service (LOS) in the peak direction for the road based on average travel speed (ATS) if the characteristics of the roadway are as follows: Table Q4-1 Percentage of Trucks Percentage of Recreational Vehicle Peak Hour Factor 10 0.97 60:40 60 Percent Directional Split Percent no-passing Zone Lane Widths Shoulder Widths Design Speed Road Length Access Points 3.35 m 1.2 m 96 km/h 8 km 10 access points per km State all assumption (if any) used in calculation..arrow_forward
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